What's your goal with being in "the ecosystem"? What feature/ what value would being in "the ecosystem" give you?
COMPUTER:
The VAST majority of your expense will be the computer cost. You want to use Multisim. According to
"It is possible to use Multisim on a Mac OS X or Linux by means a Virtual Machine, where you are in fact installing on Windows. In Mac OS X you can also use Bootcamp. Please be aware that Bootcamp and Virtual Machine are not supported methods, and NI does not recommend using them as a replacement for Multisim Live or for using a Windows based computer."
*I DO NOT KNOW IF MULTISIM WORKS IN A VIRTUALIZED ENVIRONMENT ON APPLE SILICONE!* Contact them and find out. If it does not work in a virtualized environment on Apple Silicone, you'll have to stay with Windows, or get a cheap MacBook Air M1.
IF, on the other hand, it does work with Apple Silicone with a virtualized environment, I recommend a machine with AT LEAST 24 GB of Ram. You should have 16GB assigned to the Windows VM, and 8 GB for MacOS. Or, better yet, whatever your current RAM amount is on your windows machine, double it for MacOS.
MathLab requires at least 16GB (Source:
https://www.mathworks.com/support/requirements/matlab-mac.html)
Since you'll be working with a VM, you'll need a professional machine otherwise the VMs will cause the MacBook Airs to overhead and slow down.
Sadly, the MacBook Pro, 14" M3, with 24GBs (the maximum I can select) is 2,400 Euros (from the Ireland store). That's over your limit.
The MacBook Air, 13", M2 chip with 24GB (the maximum I can select) is 1,800 Euros (from the Ireland store). That's within your limit, but just barely - and won't leave you with much room to buy new iToys.
What about buying used?
That's a possibility, but RAM is usually a build to order option, so it'll be hard to find a machine that meets your RAM requirements.
MY OPINION:
Check and see if Multisim can run in a Virtual Machine on Apple Silicone. If it is, then will this computer be a replacement for your current setup?